Abstract: Tunnels account for 92% of the water conveyance structures in Central Yunnan Water Diversion Project. The tunnel line confronts with regional active fault zone and strata with complex geological conditions for multiple times, posing threats to the construction and safe operation of the project. The engineering design case of a tunnel of the Central Yunnan Water Diversion Project crossing active fault zone is taken as research background. The structural type of the tunnel is selected, and the adaptability of tunnel structure to creep deformation and stick-slip deformation of fault zone is investigated via three-dimensional simulation, and the reasonable age of service before overhaul in the operation period of the project is put forward. Results manifest that short lining and wide deformation joint can effectively reduce the structural stress caused by the displacement of regional active fault zone, and prolong the service life of the lining structure. The research findings offer reference for the anti-fault design of tunnels.

Key words: regional active fault zone, anti-fault measures of tunnel, structural adaptability analysis, three-dimensional simulation analysis, Central Yunnan Water Diversion Project